Chapter 3: Q29. (page 78)
The adenine derivative hypoxanthine can base-pair with adenine. Draw the structure of this base pair.

Short Answer
The base pair structure of hypoxanthine with adenine is,

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Chapter 3: Q29. (page 78)
The adenine derivative hypoxanthine can base-pair with adenine. Draw the structure of this base pair.

The base pair structure of hypoxanthine with adenine is,

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The pK value for N1 of adenine is 3.64, whereas the pK value for N1 of guanine is 9.50. Explain this difference.
Hypoxanthine can also base-pair with cytosine. Draw the structure of this base pair.
Using a three-dimensional computer model of the DNA molecule (such as shown in Interactive Exercise 1), identify each of the following structural features: the 3′ and 5′ end of each strand, the atoms that make up the sugar-phosphate backbone, the major and minor grooves, the bases in several base pairs, and the atoms that participate in hydrogen bonding in A =T and G=C base pairs.
An enzyme from the human immunodeficiency virus (HIV, which causes AIDS) can synthesize DNA from an RNA template. Explain how this enzyme activity contradicts Crick’s central dogma.
The human genome contains thousands of sequences known as small open reading frames, some of which encode proteins of about 30 amino acids. What is the minimum number of nucleotides required to encode such a protein?
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